Abstract
1. 1. Oxygen consumption of muskrats ( Ondatra zibethica) after restrained and unrestrained dives of various lengths was measured. 2. 2. The post-dive excess oxygen consumption was always greater than the calculated oxygen debt. 3. 3. For equal length dives, the excess oxygen consumption was statistically the same for both restrained and unrestrained dives but the number of minutes required for recovery was greater after restrained dives. 4. 4. Possible factors that could account for these results are discussed and it is concluded that a restrained dive is a good approximation of an unrestrained dive, when measuring the magnitude of the post-dive oxygen consumption in muskrats.
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